The treatment of leg curvature should be based on the patient’s age and the specific causes of leg curvature, and the targeted treatment is as follows: 1, children: If children are growing and developing, they can consider using lower limb braces to correct X-leg or O-leg. 2, adults: Adults are mostly due to previous joint injuries, meniscal injuries and osteoarthritis, which cause inversion or valgus of the knee joint. This is a deformity of the knee joint, resulting in an X-leg or O-leg. This type of internal and external knee deformity may accelerate knee degeneration with age, and conservative treatment such as bracing is no longer effective for adults. Mild deformities can be corrected by regular follow-up, close observation of the narrowing of the joint space, and osteotomy if necessary. Severe valgus deformities require timely osteotomy and, in advanced cases, joint replacement to correct the leg curvature.